Money Flow Index Wikipedia.
With the typical price TP = (high + low + close) / 3 and the raw money
flow TP * volume, over the lookback window:
MFI = 100 - 100 / (1 + positive_flow / negative_flow)
Bars are maps with at least :high, :low, :close and :volume. See
TAlib for the remaining conventions: chronological order, oldest
first, series aligned with the input, nil when there is not enough
data or the window has no movement.
Summary
Functions
@spec mfi([map()], pos_integer()) :: float() | nil
Calculate the latest Money Flow Index.
Parameters
- bars: list of bars, oldest first.
- period: lookback window, a positive integer (default 14).
Examples
iex> bars = [
...> %{high: 12, low: 8, close: 10, volume: 100},
...> %{high: 13, low: 9, close: 12, volume: 200},
...> %{high: 11, low: 9, close: 10, volume: 150}
...> ]
iex> TAlib.Indicators.MFI.mfi(bars, 2) |> Float.round(4)
60.177@spec mfi_list([map()], pos_integer()) :: [float() | nil]
Calculate the full Money Flow Index series.
Returns a list aligned with bars: the first period entries are
nil, and every later entry is the MFI of the window ending at that
point.
Parameters
- bars: list of bars, oldest first.
- period: lookback window, a positive integer (default 14).
Examples
iex> bars = [
...> %{high: 12, low: 8, close: 10, volume: 100},
...> %{high: 13, low: 9, close: 12, volume: 200},
...> %{high: 11, low: 9, close: 10, volume: 150}
...> ]
iex> TAlib.Indicators.MFI.mfi_list(bars, 2) |> Enum.map(fn
...> nil -> nil
...> x -> Float.round(x, 4)
...> end)
[nil, nil, 60.177]